99 chevy 5.7L Vortec

[ksipes]

So i just purchassed this truck and I am 1 day old on a V2. I pulled what was off of the pcm and I am trying to find out if its the stock tune..Ajny help would be great...


11218

[gmperformancecentre]

its a stock part from the changes in the trans for the diff change (3.42 to 3.72)

[ksipes]

Hmmm I don't understand what you just said

[Taz]

Hello ksipes,

Your tune is a 1999 Black Box Vortec tune using OS 09365085 - with a 5.7 L Vortec and 4L60E transmission. The Tune Tool has a compare function (must be the same OS). Load your current tune then select the `Load Alternate calibration`function from the icons at the top of the screen.

The Tune File Depot website has a 1999 Chev Suburban available for download - it uses the same OS, engine , and transmission as your tune - use this tune as your alternate calibration. Some differences will probably be related to the gear and tires used - but the remainder of the tunes should be quite similar.


Regards,
Taz

[gmperformancecentre]

Hmmm I don't understand what you just said

What i mean is when i compared it to a stock factory tune i see that the diff ratio has been changed and the transmission calcs have been changed to suit the new diff ratio.
here is a stock factory tune.
as taz post load your current tune and load in the stock tune to see the changes in the two tunes